Heat transfer unit



Oct. 3, 1939. F; M. YOUNG HEAT TRANSFER UNIT Filed July 8, 1936 vA; z/ ,z/

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2 Sheets-Sheet 1 FTZJ Oct. 3, 1939, F. M. YOUNG HEAT TRANSFER UNIT,

Filed July 8, 1936 2 Sheets-Sheet 2 /A new 7-02 Frci atented Oct. 3, 1939 NI'I'ED STATES ATENT OFFICE 8 Claims.

My invention relates to units adapted to heat or cool an air current which is forced therethrough and is of a type usually suspended near the ceiling of the room served, and has for its object to reduce cost and weight, increase efiiciency, provide a design which is very pleasing in appearance and provide air discharging blades which may be adjusted to a desired angle hori-- zontally or transversely.

I accomplish these objects by means of novel headers, a novel motor and motor support and a novel housing and housing front.

To these and other useful ends my invention consists of parts and combinations thereof as hereinafter described and shown in the accompanying drawings in which:

Fig. 1 is a side elevation of one form of my device, the housing being shown in section on line i-l of Figure 3, and one of the headers and a tube being shown in section on line ii of Figure 4.

Fig. 2 is a vertical elevation of the unit as shown in Figure 1.

Fig. 3 is a rear elevation of the unit as shown in Figure 2.

Fig. 4 is a front sectional view of the core and housing as shown in Figure 1, taken on line -d of Figure 1, the tubes being left in perspective and a fraction ofthe lower header being broken away on line A4A6 of Figure 1.

Fig. 5 is a fractional front view of a modification.

Fig. 6 is a fractional section taken on line of Figure 5, a fraction of the housing also being shown in section on the same line. 4

As thus illustrated in Figures 1 to 4, as the preferred form of my invention, I provide an upper header I and a lower header H, each having screw threaded flanges i2 to which suitable supply and drain pipe connections may be made.

It is desired that the core of my invention which comprises two headers, a number of tubes and a multiplicity of closely spaced fins, be mounted in a circular or nearly circular housing.

, The headers are therefore shaped and operatively connected by tubes of various lengths as illustrated, for example, the end tubes I3 are expanded in header openings as at M; screw threaded openings l are provided, one for each tube end, through which a suitable expanding tool may be inserted and the tube ends made fast to the header after which these openings.

are closedby suitable screw threaded plugs (not shown). Flanges 12 may be positioned directly over two or more of the center tubes to thereby provide access to these tube ends, or if desired, a removable gasketed flange may be positioned and shaped to provide'access to the adjacent tube ends.

In order to provide for the tube connections and screw threaded openings Ill, the header must be offset as illustrated. I provide two rows of tubes in the assembly shown and since the tubes of the rows are preferably staggered, the headers must be offset transversely in staggered relation as illustrated at It (see Figure 1).

By referring to Figure 4 it will be noted that the openings leading from tube to tube transversely, are preferably gradually reduced from 15 the center length toward the end tubes, thus to equalize the flow of liquid or steam through the various length tubes.

It will be noted that the headers and tubes are of a length to thereby provide a core which is nearly circular; or, in other words, the core formed by tubes and fins practically fills the air channel at the small end of the fan shroud, which terminates adjacent the core as will hereinafter appear.

I provide a circular housing 20 into which the headers are secured and positioned about as illustrated in Figure 1. The front end of housing 20 is provided with a circumferential groove 2! which in addition to adding to the strength and improving the appearance of the housing, provides means into which a corresponding projection 22 of the annular ring 23 is adjustably secured; that is, ring 23 may be turned in its support whereby the blades 24 may be caused to di- 5 rect the discharged air in any desired direction.

Blades 24 are preferably hinged as at 25, thus when positioned as shown in Figure 1, ring 23 may be turned in either direction to thereby direct the air at any angle downward and sidewise. In order to improve the appearance and protect the front end of the device, I provide a coarse wire screen 26. I have not illustrated means for supporting my unit, it being understood that this may be. done in any one of sevem] well known ways.

I provide a projecting rib 30 near the rear of housing. 20 for the purpose of improving the appearance of the unit and adding strength to the housing. I provide a cone shaped fan shroud SI,

therear end being suitably secured to housing 20 as at 32; Shroud 3| is provided with an outwardly projecting flange 33 against which headers l0 and l I may be held, the flanges terminating in a suitablyflanged edge which is secured to housing 20. A chamber 34 is provided and I preferably fill this space with sound absorbing material 34*. Thus shroud 3| provides a large air entrance way and forms an outlet which registers with the core of the unit as illustrated, the shape being such as will prevent air resistance.

One of the novel features-of my device is the stream lined motor and motor support each acting to increase efliciency, reduce'air sounds and improve theappearance of the unit. Motor 40 other convenient manner.

Supports 43 between their ends are preferably made flat in cross section as illustrated in Figure 3, and the front of the motor including the fan hub is preferably cone shaped as illustrated in Figure 1 at 40 thus to reduce air friction and cause the air to reach the center of the core.

In Figures 5 and 6 I illustrate a modification the object being largely to economize in weight, the construction being the same as illustrated in Figures 1 to 4 inclusive, except in the core and headers. Instead of a cast header, I provide header tubes 50 which are suitably curved, the core tube connections being preferably from the front only, of the headers thus formed. Tubes 5| extend through a multiplicity of closely spaced fins and the tube ends are given a right angle bend as at 52 and the ends suitably brazed or bonded in openings in header 50.

I may elect to use separate tube angles with which to make the connections to the headers, whereby these angles may first be secured to the headers after which the tubes may be inserted in the connecters and made fast by bonding. If I find it desirable to use oval tubes for the core, I may use adapters asillustrated in my pending application, Serial No. 85,047, filed June 13, 1936. In the design shown in Figures 1 to 4, the tube ends may be straight because of the offset feature of the headers as illustrated in Figures 1 and 4. However, in the design shown in Figures 5 and 6, the adapters or tube ends will necessarily have a right angle bend as at 52.

I provide a baflle ring 53, the inner end of which registers with the outlet opening in shroud 3|, thus to restrict the air flow outlet to the core only.

Thus I have illustrated and described the preferred forms of my invention, it being understood that minor changes in details and arrangement of parts may be made without departing from the spirit and scope of the appended claims.

Having thus shown and described my invention, I claim:

1. A heat transfer unit of the class described, comprising a circular in cross section housing and a heat transfer core adapted to fit transversely in the outlet end thereof, a motor in the inlet end of said housing having a fan which is positioned adjacent said core, a conically shaped fan shroud the large end of which is secured to the rear end of said housing, the front end terminating near the inner edges of the headers of said core and having an outwardly extending flange which contacts said housing forming a chamber, said chamber being filled with sound absorbing material.

2. A heat transfer unit of the class described, comprising a circular in cross section housing anda heat transfer core adapted to fit transversely in the outlet end thereof, a motor positioned in the inlet end of said housing having a fan which is positioned adjacent said core, a conically shaped fan shroud, the large end of which is secured to the rear end .of said housing the front end terminating near the inner rear edges of the headers of said core and having an outwardly extending flange which contacts said housing forming a chamber, said chamber being filled with sound absorbing material, said motor being secured to said fan shroud,

3. A heat transfer unit of the class described, comprising a circular in cross section housing and a heat transfer core adapted to fit transversely in the outlet end thereof, a motor positioned in the rear end of said housing having a. fan which is positioned adjacent said core, a conically shaped fan shroud the large end of which is secured to the rear end of said housing, the front end terminating near the inner edges of the headers of saidcore and having an outwardly extending flange which is secured to said housing, forming a chamber, said chamberbeing filled with sound absorbing material, said motor being secured to said fan shroud, an annular ring rotatably secured in the front of said housing and having adaptable air directing blades whereby the air may be discharged in any direction.

4. A heat transfer device of the class described, comprising upper and lower spaced headers which are curved, the concave sides facing inwardly, a number of tubes and a multiplicity of .closely spaced fins through which said tubes extend, said tubes being formed in two rows of various lengths, each having at their ends right angle bends which are operatively connected into openings in the side walls of said headers whereby a core is formed the headers of which may be embraced by a circular housing.

' 5. A heat transfer device of the class described, comprising upper and lower spaced headers which are curved for their length, the concave sides facing inwardly, a number of tubes and a multiplicity of closely spaced fins through which said tubes extend, said tubes being formed into two or more rows and being of various lengths, each having at their ends right angle bends which are operatively connected into openings in the side walls of said header whereby a core is formed the headers of whic are embraced by the outlet end of a circular housing, the other end of said housing having a fan shroud, the inner end having a diameter which registers with the inner edges of said headers and having an outwardly extending flange which is secured to said housing forming a chamber, said chamber being filled with sound absorbing material, a fan and fan motor surrounded by said shroud whereby the air is forced through said shroud and core.

6. A heat transfer device of the class described, comprising upper and lower spaced headers which are curved for their length, the concave sides facing inwardly, a number of tubes and a multiplicity of closely spaced fins through which said tubes extend, said tubes being formed into two rows and being of various lengths, each having at their ends right angle bends which are operativelyconnected into openings in the side walls of said headers whereby a core is formed the headers of which are embraced by the outlet end of a circular housing, the other end of said housing having a conically shaped fan shroud, the inner and smaller end having a diameter which registers with the inner edge of said headers and having an outwardly extending flange which is secured to said housing forming a chamber, a fan motor surrounded by said shroud and being attached thereto.

7. A heat transfer device of the class described, comprising a circular in' cross section housing, upper and lower spaced headers which are curved for their length, the concave sides facing inwardly, a number of tubes and a multiplicity of closely spaced fins through which said tubes extend, said tubes being formed in two or more rows, each tube having at its ends right angle bends which are operatively connected into openings in the side walls of said headers whereby a core is formed, the headers of which are embraced by said housing, a conically shaped fan shroud the larger end of which is secured to the rear end of said housing and the inner end having a diameter which registers with the inner edges of said headers and having an outwardly extending flange which is secured to said housing forming a chamber, a fan and a fan motor surrounded by and secured to said shroud whereby air is forced through said shroud and core, an annular ring rotatably mounted in the front end of said housing having spaced air directing blades whereby the air may be discharged at any desired angle.

8. A heat exchange device of the class described, comprising in combination, a circular in cross section housing, upper and lower headers each being curved forming sectors, the concave sides facing each other, said headers being shaped and positioned whereby their outer surfaces combined form more than one half of a single circle, a number of tubes in parallel relation operatively connecting said headers and a multiplicity of closely spaced fins through which the tubes extend forming a core, said core positioned in the front end of said housing, the headers being embraced thereby, a conically shaped fan shroud the large end being secured to the rear end of said housing, the front end terminating adjacent the rear inner edges of said headers and having an outwardly extending flange which contacts said housing forming an annular chamber and a stop for the rear sides of said headers, a motor positioned in the large end of said shroud and having a fan positioned adjacent said core. 1

FRED M. YOUNG. 

